<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="style" >
</head>
<body>
     <!-- Standard button -->
     <button type="button" class="btn btn-default btn-lg">
        （默认样式）Default
      </button>
  
      <!-- Provides extra visual weight and identifies the primary action in a set of buttons -->
      <button type="button" class="btn btn-primary" disabled="disabled">
        （首选项）Primary
      </button>
  
      <!-- Indicates a successful or positive action -->
      <button type="button" class="btn btn-success btn-sm">
        （成功）Success
      </button>
  
      <!-- Contextual button for informational alert messages -->
      <button type="button" class="btn btn-info btn-xs">（一般信息）Info</button>
  
      <!-- Indicates caution should be taken with this action -->
      <button type="button" class="btn btn-warning btn-block">
        （警告）Warning
      </button>
  
      <!-- Indicates a dangerous or potentially negative action -->
      <button type="button" class="btn btn-danger">（危险）Danger</button>
  
      <!-- Deemphasize a button by making it look like a link while maintaining button behavior -->
      <button type="button" class="btn btn-link">（链接）Link</button>
</body>
</html>